Arrange the following in order of increasing radii : [3 marks]

(a) $C l^{-}, C l$ (b) $M g^{2 +}, M g, M g^{+}$ (c) N, O, P

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Solution

a) Anion is larger than the corresponding neutral atom as electron is added due to which repulsion increases. Hence, it size increases. The order is $C l^{-} > C l$ [1 mark]

b) Cation is smaller than the corresponding neutral atom as electron is removed which is far away from the nucleus. The order is $M g$ > $M g^{+}$ > $M g^{+ 2}$ [1 mark]

(c) Atomic size decreases across the period (due to increase in effective nuclear charge) and increases down the group (due to addition of new shells). The order is P > N > O. [1 mark]

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Arrange the following in order of increasing radii :

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Question 17
Arrange the following elements in the order of their decreasing metallic character
Na, Si, Cl, Mg, Al

(a) Cl > Si >Al > Mg >Na
(b) Na >Mg >Al >Si > Cl
(c) Na > Al > Mg > Cl > Si
(d) Al > Na> Si > Ca> Mg

arrange the following as stated
1)N,O,F,Cl (increasing order of electron gain enthalpy)
2) F,O,N,Cl (increasing order of electronnegativity)
3)P,N,S,O (increasing orer of ionizationenthalpy)

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Arrange the following in order of increasing radii : [3 marks] (a) Cl−,Cl (b) Mg2+,Mg,Mg+ (c) N, O, P

Arrange the following in order of increasing radii : [3 marks]

(a) $C l^{-}, C l$ (b) $M g^{2 +}, M g, M g^{+}$ (c) N, O, P